Originally Posted by Epoch
But what would be a good thing to hook the relay up to? It's gotta be something you want on when you're driving the car, but a thief wouldn't turn on.
Relays work great for starter kills, but are less convenient for fuel cutoffs.
I was considering the option of installing a relay as a more secure means of switching a high amperage circuit w minimal resistance. The relay would be controlled by a low voltage circuit added to the car, with the switch controlling the relay hidden inside some storage compartment or under a false panel.
I'll come back to discuss this a bit more clearly in a bit, hopefully.

h: